C8051F320-TB Silicon Laboratories Inc, C8051F320-TB Datasheet - Page 129
C8051F320-TB
Manufacturer Part Number
C8051F320-TB
Description
BOARD PROTOTYPING W/C8051F320
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F320-TB
Contents
Board
Processor To Be Evaluated
C8051F320/F321
Interface Type
USB
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
C8051F320
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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Registers XBR0 and XBR1 are used to assign the digital I/O resources to the physical I/O Port pins. Note
that when the SMBus is selected, the Crossbar assigns both pins associated with the SMBus (SDA and
SCL); when the UART is selected, the Crossbar assigns both pins associated with the UART (TX and RX).
UART0 pin assignments are fixed for bootloading purposes: UART TX0 is always assigned to P0.4; UART
RX0 is always assigned to P0.5. Standard Port I/Os appear contiguously after the prioritized functions
have been assigned.
Important Note: The SPI can be operated in either 3-wire or 4-wire modes, depending on the state of the
NSSMD1-NSSMD0 bits in register SPI0CN. According to the SPI mode, the NSS signal may or may not be
routed to a Port pin.
SF Signals
PIN I/O
TX0
RX0
SCK
MISO
MOSI
NSS*
SDA
SCL
CP0
CP0A
CP1
CP1A
SYSCLK
CEX0
CEX1
CEX2
CEX3
CEX4
ECI
T0
T1
SF Signals
Port pin potentially available to peripheral
Special Function Signals are not assigned by the Crossbar. When these signals are enabled, the Crossbar must
be manually configured to skip their corresponding port pins.
Figure 14.4. Crossbar Priority Decoder with Crystal Pins Skipped
0
0
1
0
2
1
P0SKIP[0:7]
3
1
P0
4
0
5
0
6
0
7
0
0
0
*NSS is only pinned out in 4-wire SPI mode
1
0
Rev. 1.4
2
0
P1SKIP[0:7]
3
0
P1
4
0
5
0
6
0
7
0
0
0
P2SKIP[0:3]
C8051F320/1
1
0
2
0
3
0
P2
4
5
6
7
129
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